Concurrent dual‐band six‐loop‐antenna system with wide 3‐dB beamwidth radiation for MIMO access points

A high‐gain, wide‐beamwidth, six‐loop‐antenna MIMO system suited for wireless access points in the concurrent WLAN 2.4 and 5 GHz bands is presented.The antenna system mainly comprises an antenna ground plane and single‐band loop antennas, among which the three antennas are designated for 2.4 and 5 GHz operation, respectively. The antennas are set in a sequential, rotating arrangement on the ground plane with an equal inclination angle of 60° to form a symmetrical structure, and the 2.4 and 5 GHz loops are facing each other one by one. The experimental results show that good port isolation can be obtained between antenna ports. High‐gain, directional radiation patterns with wide 3‐dB beamwidth in elevation planes are also observed. Details of a design prototype are described and discussed in the article.